Reducing heat loss through doors and windows

Reducing heat losses from doors. Draught proof your door by fitting draught seals, prevent draughts through letter boxes by fitting fit a cover/brush and through keyholes by fitting a keyhole cover. If you have a catflap, you can fit insultation or a blanket flap.

Keep the heat where you want it. Close the doors on unused rooms to keep the heat where you need it.

Reducing heat loss from windows. Double or triple glazing will reduce heat loss considerably compared with single glazed windows. Less costly options are to cover them in a clear plastic film (available at DIY shops) that tightens over the pane when heated with a hairdryer. The image below (taken from the outside a home) shows heat leaking from single glazed glass in a front door; it also shows a letter box with a good letter box cover.

Image taken from outside the home showing heat leaking from single glazed panels at top. Also showing impact of a well fitted letter box cover

Curtains also reduce heat losses from windows. Close curtains and blinds at dusk, even in rooms you’re not using. If you have long curtains over a radiator, tuck the curtains behind the radiator (so as not to heat the window) or, better still, shorten the curtains! If your curtains are thin, sew a layer of heavy lining material inside them or buy some ready-made thermal curtain liners that hook on.

Reducing heat loss through walls and floors

Losses from radiators. Radiators on external walls can often direct the heat outside; consider putting foil behind radiators to reflect heat into the room; radiator foil is available from DIY stores, though kitchen foil does a good job too!

Losses though floorboards. If you have wooden floorboards (particularly those in older houses that are laid directly on beams), you can reduce heat loss by filling the gaps between and around them with an acrylic sealant or with tubing that you can put between the gaps. Timber floors can also be insulated by lifting the floorboards and laying mineral wool insulation supported by netting between the joists. Gaps between floor boards and skirting boards are also an area where heat can be lost; DIY stores have a variety of options for filling gaps. Using rugs or carpet also helps to reduce heat loss. In the image below shows floor boards that are laid directly onto beam. Significant draughts were coming through the floor boards; the image was taken part way through fitting gap sealer – it had been fitted in the lower part of the image but not the upper part.

Gap sealer part fitted between floor boards

Stop heat going up the chimney. Put a chimney balloon is any chimneys that are not being used. Remember to take them out again should you decide to use your chimney.

Install or top up cavity wall insultation. If you have cavity wall insulation you can use a thermal imaging camera to check whether there are any areas missing insultation. In a house with cavity wall insulation, you would be able to see whether the insulation went around the whole house or whether the cavity was built room by room with bricks going directly from outside to inside at the room junctions. If the cavity wall did not go all the way round the outside of the house there would effectively be a cold bridge where the bricks were allowing heat to escape from your home.

Solid wall insulation. Solid walls can lose heat just like cavity walls; the only way to reduce this heat loss is to insulate them on the inside or (much better) on the outside. It’s not cheap, but you will soon see the benefits to your heating bill.

Thermal wallpaper. You can also put thermal wallpaper on the external walls in your home; this can be useful additional insulation or an alternative for homes with solid walls where solid wall insulation is not possible. This is something that can be done room by room as and when rooms are re-decorated.

Reducing heat loss through the roof

Insulate your loft. If you only have 100mm insulation topping this up to 300mm will cut your heat loss from the roof by 50%. If you only have 50mm you can reduce heat loss by 75% – source.

Check your loft-hatch. Have loft insulation but there are still draughts? Check to see if your loft-hatch has been insulated. You can also try to prevent those small drafts around loft-hatch by using use draught proofing tape. The image below shows a loft that has been insulated with an uninsulated loft hatch.

Image shows the effect of an un-insulated loft hatch compared with the surrounding insulated roof.

Like to check out you home with a thermal imaging camera?

If you live in the district of St Albans you can borrow one of Sustainable St Albans two Thermal Imaging Cameras to see where heat is leaking from your house. See herefor information about borrowing our Thermal Imaging cameras.

Other ways to reduce your energy consumption

Use your appliances less, for example doing full loads of washing or dishwashing, using a clothes line to dry clothes.

Use LED lighting. Lighting accounts for 7 per cent of a typical household’s energy bill. Cutting your lighting bill is one of the easiest ways to save energy and money. Houses typically use a mixture of standard light fittings and downlighters or spotlight fittings. LED bulbs are now available for most fittings, replacing bulbs with LED ones will instantly save your home energy and money.

Controlling your heating. Boilers and heaters account for two-thirds of the energy used in our homes, so changing the settings just a little can have a big impact.

Lagging hot water tanks and water pipes. Many hot water tanks in our homes are not sufficiently lagged. This means that heat is continually being lost, and your boiler has to work harder to keep the stored water to the desired temperature. Heat is also lost from pipes that carry hot water around your house. In some places this is ok (e.g. through a cupboard that is used to dry laundry) but often, it’s just more unnecessary and expensive heat loss. Fiiting a jacket on your hot water tank and insulating your hot water pipes will reduce your energy bills; there are a variety of insultation options for pipes available at DIY stores.

Be a real turn off! Leaving lights, TVs, computers and radios on when there’s no one in the room is an obvious waste of money and energy. Some appliances also use a lot of energy in standby mode, particularly if they are older appliances.

When replacing appliance look at the energy ratings. Appliances are responsible for a significant proportions of a typical home’s electricity bill: Televisions, set-top boxes, digital TV recorders, DVDs and DAB radios combined are responsible for around a fifth of a typical home’s electricity bill. Computer Equipment – household computers, printers, monitors and laptops on average make up around a further 13%. When you need to replace an appliance, you will have an opportunity to replace it with a more efficient one.